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(a) TEM and (b) UV–vis spectroscopy results of GNPs. (c) Dynamic light spectra (DLS) of the GNPs. DLS results show that GNPs were less aggregated in water and homogeneously distributed with a size range of 20–40 nm. (d) X-ray photoelectron spectroscopy (XPS) studies of GNPs to confirm the structural analysis of the GNP formation.
